Defining a schema for a struct with nullable fields and transforming input

import { Schema as S } from 'effect'
export const S1 = S.partial( //
  S.Struct({
    name: S.NullOr(S.String),
    id: S.NullOr(S.String),
    internal: S.NullOr(S.Boolean),
  }),
)
--> 
export const S2 = S.partial(
  S.Struct({
    name: S.String,
    id: S.String,
    internal: S.Boolean,
  }),
)